JEE Main 2019 (Online) 9th April Evening Slot | Electromagnetic Induction Question 89 | Physics

Two coils 'P' and 'Q' are separated by some distance. When a current of 3 A flows through coil 'P', a magnetic flux of 10^–3 Wb passes through 'Q'. No current is passed through 'Q'. When no current passes through 'P' and a current of 2 A passes through 'Q', the flux through 'P' is :-

3.67 × 10^–4 Wb

3.67 × 10^–3 Wb

6.67 × 10^–4 Wb

6.67 × 10^–3 Wb

JEE Main 2019 (Online) 9th April Morning Slot

MCQ (Single Correct Answer)

-1

The total number of turns and cross-section area in a solenoid is fixed. However, its length L is varied by adjusting the separation between windings. The inductance of solenoid will be proportional to :

1/L²

1/L

L²

JEE Main 2019 (Online) 8th April Morning Slot

MCQ (Single Correct Answer)

-1

A 20 Henry inductor coil is connected to a 10 ohm resistance in series as shown in figure. The time at which rate of dissipation of energy (joule's heat) across resistance is equal to the rate at which magnetic energy is stored in the inductor is : JEE Main 2019 (Online) 8th April Morning Slot Physics - Electromagnetic Induction Question 91 English

JEE Main 2019 (Online) 8th April Morning Slot Physics - Electromagnetic Induction Question 91 English

$${2 \over {\ln 2}}$$

$${\ln 2}$$

$$2{\ln 2}$$

$${1 \over 2}{\ln 2}$$

JEE Main 2019 (Online) 12th January Evening Slot

MCQ (Single Correct Answer)

-1

A 10 m long horizontal wire extends from North East to South West. It is falling with a speed of 5.0 ms^–1, at right angles to the horizontal component of the earth's magnetic field of 0.3 $$ \times $$ 10^–4 Wb/m². The value of the induced emf in wire is :

0.3 $$ \times $$ 10^–3 V

2.5 $$ \times $$ 10^–3 V

1.5 $$ \times $$ 10^–3 V

1.1 $$ \times $$ 10^–3 V

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